CN113062200B - Composite type back-cable-free cable-stayed bridge and construction method thereof - Google Patents
Composite type back-cable-free cable-stayed bridge and construction method thereof Download PDFInfo
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- CN113062200B CN113062200B CN202110292731.8A CN202110292731A CN113062200B CN 113062200 B CN113062200 B CN 113062200B CN 202110292731 A CN202110292731 A CN 202110292731A CN 113062200 B CN113062200 B CN 113062200B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a composite type back-cable-free cable-stayed bridge, which comprises a steel structure main beam, a steel structure stressed main tower, a steel structure stressed auxiliary tower, a pier structure and a bridge abutment structure, wherein the steel structure stressed main tower and the steel structure stressed auxiliary tower are sequentially arranged on the steel structure main beam along the bridge direction; a main tower stay cable is connected between the steel structure stressed main tower and the steel structure main beam, an auxiliary tower stay cable is connected between the steel structure stressed auxiliary tower and the steel structure main beam, a main tower micro-expansion concrete filling section is filled on the steel structure stressed main tower, and an auxiliary tower micro-expansion concrete filling section is filled on the steel structure stressed auxiliary tower. The invention can meet the use requirement of the long-term service of the cable-stayed bridge without the back cable; the landscape performance is good, the construction risk is low, and the economy is good.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a composite type back-cable-free cable-stayed bridge and a construction method thereof.
Background
In urban bridge construction and traffic industries, bridge design does not simply pursue economy and practicability, but a bridge landscape effect of 'one bridge and one scene' is pursued. The cable-stayed bridge is a bridge type with strong spanning capability and good landscape property, and is continuously applied to urban bridges. With the rapid development of bridge industry in China in recent years, various bridge types of cable-stayed bridges are developed endlessly, and the requirement for gradually conforming to aesthetics of bridge modeling design is stronger.
The conventional backless cable-stayed bridge tower is realized by depending on the self weight of a tower body, so that the section of each section of the tower body needs to correspond to the horizontal force of an inclined cable, and the more the bridge tower is inclined, the higher the working efficiency of the self weight of the tower body is. A conventional back-cable-free cable-stayed bridge usually selects a bridge tower which is relatively bulky in size, the size of a main beam is relatively large, the coordination of the ratio of the height of the bridge tower to the span cannot be considered in the height, and the inherent strength of the structure is lost. Particularly, when the main beam is made of a steel structure, the light steel structure main beam reduces the construction difficulty of the bridge tower; the bridge tower inclines at a certain angle, although the self weight of the tower body can be relied on to balance the inclined cable force; the weight requirements of the tower also dictate that the size of the tower be large.
In view of the above situation, in combination with the characteristics of the cable-stayed bridge system without a backstay, a cable-stayed bridge structure without a backstay with low construction risk, investment saving and good landscape modeling is required. The invention can not only perfectly coordinate the tower height of the main tower and the span ratio of the main beam, but also increase the asymmetric natural aesthetic feeling of the cable-stayed bridge without the backstay. The method can reduce the engineering risk (reduce the tower height) and save the investment (reduce the size of the main tower) while improving the landscape of the bridge, has good economic benefit and popularization significance, and provides a new idea for the structural form of the backstay-free cable-stayed bridge.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a composite type back-cable-free cable-stayed bridge and a construction method thereof aiming at the defects in the prior art, which can meet the use requirement of long-term service of the back-cable-free cable-stayed bridge; the landscape property is good, the construction risk is low, and the economical efficiency is good.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a composite type back-cable-free cable-stayed bridge comprises a steel structure main beam, a steel structure stressed main tower, a steel structure stressed auxiliary tower, a pier structure and a bridge abutment structure, wherein the steel structure stressed main tower and the steel structure stressed auxiliary tower are sequentially arranged on the steel structure main beam along the bridge direction, and the pier structure and the bridge abutment structure are arranged at the bottom of the steel structure main beam;
a main tower stay cable is connected between the steel structure stressed main tower and the steel structure main beam, an auxiliary tower stay cable is connected between the steel structure stressed auxiliary tower and the steel structure main beam, a main tower micro-expansion concrete filling section is filled on the steel structure stressed main tower, and an auxiliary tower micro-expansion concrete filling section is filled on the steel structure stressed auxiliary tower.
According to the technical scheme, the main tower stay cable is connected with a main tower micro-expansion concrete pouring section; and the auxiliary tower stay cable is connected with the auxiliary tower micro-expansion concrete pouring section.
According to the technical scheme, the steel structure stressed main tower and the steel structure stressed auxiliary tower are both filled with micro-expansion concrete in the partial area of the tower body to balance weight, so that a micro-expansion concrete filling section is formed, and the dead weight of the main tower is effectively increased to balance the strong overturning moment generated by the stay cable.
According to the technical scheme, the steel structure main beam, the steel structure stressed main tower and the steel structure stressed auxiliary tower are all prefabricated in a factory and are hoisted and welded after being transported to the site.
According to the technical scheme, the shapes of the steel structure stressed main tower and the steel structure stressed auxiliary tower are crescent curves.
According to the technical scheme, the size, the height of the tower body and the number of connected stay ropes of the steel structure stressed main tower are 1.5-3 times of those of the steel structure stressed auxiliary tower.
According to the technical scheme, the steel structure stressed main tower and the steel structure stressed auxiliary tower are of a backless cable-stayed bridge structure, and the main tower stay cables and the auxiliary tower stay cables are pulled to a main span of the steel structure main beam;
the main tower stay cable is arranged in the span range of 2/3 of the main span at the side of the steel structure stressed main tower, and the auxiliary tower stay cable is arranged in the span range of 2/3 of the main span at the side of the steel structure stressed auxiliary tower.
According to the technical scheme, the number of the stay cables is 9, the number of the main tower stay cables is 6, the number of the auxiliary tower stay cables is 3, and the distance between every two adjacent main tower stay cables and the distance between every two adjacent auxiliary tower stay cables are 7-10 meters.
According to the technical scheme, pier structures are uniformly arranged below the steel structure stressed main tower and the steel structure stressed auxiliary tower; the abutment structure is arranged outside the pier structure.
The construction method of the composite type backless cable-stayed bridge comprises the following steps:
1) prefabricating a steel structure main beam, a steel structure stressed main tower and a steel structure stressed auxiliary tower in a factory in sections;
2) erecting a girder construction support platform, a construction pier structure and a bridge abutment structure;
3) the steel structure main beam, the steel structure stressed main tower and the steel structure stressed auxiliary tower are conveyed to a construction site section by section, the steel structure main beam sections are sequentially hoisted to the construction site, and the steel structure main beam is welded until the steel structure main beam is completely erected and welded;
4) erecting a steel structure stressed main tower and a steel structure stressed auxiliary tower construction support platform;
5) hoisting and welding the steel structure stressed main tower and each section of the steel structure stressed auxiliary tower section by section until the steel structure stressed main tower and the steel structure stressed auxiliary tower are capped;
6) sequentially carrying out erection and tensioning construction on the main tower stay cable;
sequentially carrying out erection and tensioning construction on the auxiliary tower stay cables;
7) after the construction of the stay cable is finished, the steel structure stressed main tower and the steel structure stressed auxiliary tower are respectively poured into a main tower micro-expansion concrete pouring section and an auxiliary tower micro-expansion concrete pouring section in partial areas of the tower body.
The invention has the following beneficial effects:
1. the combined type backless cable-stayed bridge breaks through the bottleneck of conventional treatment of a structural mode of a main tower of the cable-stayed bridge, the main tower of the conventional steel structure backless cable-stayed bridge is replaced by the main tower with a stressed main tower and an auxiliary tower with a stressed auxiliary tower, and micro-expansion concrete is poured into partial areas of the main tower and the auxiliary tower with the steel structure for balancing weight, so that the self weight of a tower body is effectively increased to balance the strong overturning moment generated by the stay cable, and the use requirement of the backless cable-stayed bridge on long-term service can be met; the landscape performance is good, the construction risk is low, and the economy is good.
2. The steel structure main beam, the steel structure main tower and the steel structure auxiliary tower are all prefabricated in a factory and are subjected to batch welding construction, so that the construction quality of the steel structure is ensured, the construction period of the back-cable-free cable-stayed bridge is greatly shortened, and the difficulty of site construction is reduced; after the composite type back-cable-free cable-stayed bridge adopts the structural form of the main tower and the auxiliary tower, the span proportion of the tower height of the main tower and the main beam can be perfectly coordinated, and meanwhile, the asymmetric natural aesthetic feeling of the back-cable-free cable-stayed bridge is also increased; the composite type back-cable-free cable-stayed bridge can reduce the construction risk (reduce the height of the tower) and save the investment (reduce the size of the main tower) while improving the landscape of the bridge, has good economic benefit and popularization significance, and provides a new idea for the structural form of the back-cable-free cable-stayed bridge; the invention has reasonable structural design, clear force transmission path and simple and quick construction.
Drawings
FIG. 1 is a schematic structural diagram of a composite backless cable-stayed bridge according to an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
in the figure, 1-a steel structure stressed main tower, 2-a steel structure stressed auxiliary tower, 3-a main tower stay cable, 4-an auxiliary tower stay cable, 5-a main tower micro-expansion concrete pouring section, 6-an auxiliary tower micro-expansion concrete pouring section, 7-a steel structure main beam, 8-a pier structure and 9-a bridge abutment structure.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 3, the composite back-cable-free cable-stayed bridge in one embodiment of the invention includes a steel structure main beam 7, a steel structure stressed main tower 1, a steel structure stressed auxiliary tower 2, a pier structure 8 and a bridge abutment structure, wherein the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are sequentially arranged on the steel structure main beam 7 along a bridge direction, and the pier structure 8 and the bridge abutment structure are arranged at the bottom of the steel structure main beam 7;
a main tower stay cable 3 is connected between the steel structure stressed main tower 1 and the steel structure main beam 7, and an auxiliary tower stay cable 4 is connected between the steel structure stressed auxiliary tower 2 and the steel structure main beam 7. The combined type steel structure bridge tower after concrete weight balancing transfers engineering materials wasted to the section size and height of a single main tower in a conventional back-cable-free cable-stayed bridge to a main bridge tower and an auxiliary bridge tower with higher concrete weight balancing efficiency, so that the manufacturing cost and the construction difficulty of the main tower of the back-cable-free cable-stayed bridge are reduced, most importantly, the dependence of the back-cable-free cable-stayed bridge on the self weight of the main tower is reduced, and a basic premise and favorable advantages are provided for designing a more harmonious and attractive bridge.
Furthermore, a main tower micro-expansion concrete pouring section 5 is poured on the steel structure stress main tower 1, and a main tower stay cable 3 is connected with the main tower micro-expansion concrete pouring section 5;
an auxiliary tower micro-expansion concrete filling section 6 is filled in the steel structure stress auxiliary tower 2, and an auxiliary tower stay cable 4 is connected with the auxiliary tower micro-expansion concrete filling section 6.
Further, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are both filled with micro-expansion concrete in partial areas of the tower body to carry out balance weight, a micro-expansion concrete filling section is formed to carry out balance weight, and the dead weight of the main tower is effectively increased to balance the strong overturning moment generated by the stay cables.
Further, the steel structure main beam 7, the steel structure stress main tower 1 and the steel structure stress auxiliary tower 2 are all prefabricated in a factory and are hoisted and welded after being transported to the site.
Furthermore, the shapes of the steel structure stress main tower 1 and the steel structure stress auxiliary tower 2 are crescent curves, and the front wall and the rear wall along the forward bridge are curves.
Furthermore, the size, the height of the tower body and the number of connected guys of the steel structure stressed main tower 1 are 1.5-3 times of those of the steel structure stressed auxiliary tower 2; the optimal choice is 2 times.
Furthermore, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are both of a backless cable-stayed bridge structure, the main tower stay cables 3 and the auxiliary tower stay cables 4 are both pulled to the main span midspan direction of the steel structure main beam 7, and the main tower stay cables 3 and the auxiliary tower stay cables 4 can be intersected after being extended;
the main tower stay cable 3 is arranged in the span range of 2/3 of the main span at the side of the steel structure stressed main tower, and the auxiliary tower stay cable 4 is arranged in the span range of 2/3 of the main span at the side of the steel structure stressed auxiliary tower.
Furthermore, the number of the stay cables is 9, wherein 6 main tower stay cables 3 are provided, 3 auxiliary tower stay cables 4 are provided, and the distance between every two adjacent main tower stay cables 3 and the distance between every two adjacent auxiliary tower stay cables 4 are both 7-10 meters; the most preferred is 9 meters.
Furthermore, pier structures 8 are uniformly arranged below the steel structure stress main tower 1 and the steel structure stress auxiliary tower 2; the abutment structures are arranged outside the pier structures 8, or the abutment structures are respectively arranged on both sides of the two pier structures 8.
The construction method of the composite type backless cable-stayed bridge comprises the following steps:
1) prefabricating a steel structure main beam 7, a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2 in a section in a factory;
2) erecting a girder construction support platform, a construction pier structure 8 and a bridge abutment structure 9;
3) the steel structure main beam 7, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are transported to a construction site section by section, the sections of the steel structure main beam 7 are sequentially hoisted to a main beam construction support platform by adopting a crane in sequence, and the steel structure main beam 7 is welded (in order to save the construction period, the steel structure main beam 7 can be hoisted simultaneously from two banks to the midspan direction) until the erection and welding of the steel structure main beam 7 are completely finished;
4) assembling tower cranes, and erecting a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2 construction support platform;
5) hoisting and welding the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 sections section by using a tower crane until the capping of the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 is finished;
6) sequentially carrying out erection and tensioning construction of the main tower stay cables 3 (the stay cables are sequentially installed from near to far of the main tower), and strictly executing the erection sequence and the tensioning tonnage of the stay cables according to monitoring instructions;
sequentially carrying out erection and tensioning construction of the auxiliary tower stay cables 4 (the stay cables are sequentially installed from near to far of the main tower), and strictly executing the erection sequence and the tensioning tonnage of the stay cables according to monitoring instructions;
7) after the construction of the inhaul cable is finished, the steel structure stressed main tower and the steel structure stressed auxiliary tower are respectively poured into a main tower micro-expansion concrete pouring section 5 and an auxiliary tower micro-expansion concrete pouring section 6 in partial areas of the tower body.
Further, after the step 7), the following steps are also included: 8) dismantling auxiliary facilities such as a tower crane and a main beam construction support platform;
9) the full bridge uniformly performs construction of a bridge deck system and traffic engineering until completion of the vehicle.
The working principle of the invention is as follows: the utility model provides a combined type does not have back of body cable-stay bridge which characterized in that, including steel construction girder 7, pier structure 8, steel construction atress king tower 1, steel construction atress king tower 2 and the king tower suspension cable 3 of setting between king tower and girder, the king tower suspension cable 4 of setting between king tower and girder, the section of pouring into king tower micro-expansion concrete perfusion 5 and the section of pouring into king tower micro-expansion concrete perfusion 6, pier structure 8 and abutment structure 9 constitute jointly. The combined type steel structure bridge tower is composed of a steel structure stress main tower 1 and a steel structure stress auxiliary tower 2, and the bridge tower is subjected to counterweight on a steel structure main tower micro-expansion concrete pouring section 5 and a steel structure auxiliary tower micro-expansion concrete pouring section 6. The composite steel structure bridge tower after being weighted by concrete transfers engineering materials wasted to the section size and height of a single main tower in a conventional back-cable-free cable-stayed bridge to a main bridge tower and an auxiliary bridge tower with higher concrete weighting efficiency, thereby not only reducing the manufacturing cost and the construction difficulty of the main tower of the back-cable-free cable-stayed bridge, but also reducing the dependence of the back-cable-free cable-stayed bridge on the dead weight of the main tower, and providing basic premise and favorable advantage for designing a more harmonious and more beautiful bridge.
In the invention, the steel structure main beam 7, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are all prefabricated in a factory, and after the prefabrication is finished, all sections of the steel structure main beam 7, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are pre-assembled in a full-section mode on an engineering jig frame (after all sections are confirmed to be capable of being welded) and then can be transported to the site section by adopting a beam transporting vehicle. Hoisting and welding a steel structure main beam 7, a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2 section by using equipment such as a tower crane and the like on site, then tensioning a main tower stay cable 3 and an auxiliary tower stay cable 4, and finally pouring a main tower micro-expansion concrete pouring section 5 and an auxiliary tower micro-expansion concrete pouring section 6 to form a whole.
A construction method of a composite type cable-stayed bridge without a back cable comprises the following steps:
firstly, prefabricating sections of a steel structure main beam 7, a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2 in a factory according to the overall design requirement of a bridge structure, and after prefabrication is completed, performing full-section pre-assembly on the sections of the steel structure main beam 7, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 on an engineering jig frame (confirming that all the sections can be welded for construction), and then transporting the sections to the site by sections by adopting a beam transporting vehicle;
step two, constructing a trestle (if any) at the bridge position, building a girder construction support platform, constructing a pier structure 8 and a bridge abutment structure 9 while prefabricating a steel structure girder 7, a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2 in a factory;
and step three, according to the arrangement of a construction period, the steel structure main beam 7, the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are conveyed to a construction site section by section, the sections of the steel structure main beam 7 are sequentially hoisted to the main beam support by adopting a crane, and the steel structure main beam 7 is welded (in order to save the construction period, the sections can be hoisted simultaneously from two banks to the midspan direction) until the erection and welding of the steel structure main beam 7 are completely finished.
And fourthly, assembling the tower crane, and erecting a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2 to construct a support platform.
And fifthly, hoisting and welding the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 section by using a tower crane until the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 are capped.
And step six, sequentially carrying out the main tower stay cables 3, the erection and tensioning construction of the main tower stay cables (the stay cables are sequentially installed from near to far of the main tower), and strictly executing the erection sequence and the tensioning tonnage of the stay cables according to the monitoring instruction.
And step eight, sequentially erecting and tensioning the stay cables 4 of the auxiliary tower (sequentially installing the stay cables from the near to the far of the main tower), and strictly executing the erecting sequence and the tensioning tonnage of the stay cables according to the monitoring instruction.
And step nine, after the stay cable construction is finished, pouring a main tower micro-expansion concrete pouring section 5 and an auxiliary tower micro-expansion concrete pouring section 6, and removing auxiliary facilities such as a tower crane and a main beam support.
Step ten, the full bridge unifies the construction of the bridge deck system and the traffic engineering until the completion of the traffic.
Compared with the traditional back-cable-free cable-stayed bridge structure, the combined back-cable-free cable-stayed bridge breaks through the bottleneck of conventional treatment of a cable-stayed bridge main tower structure mode, divides a conventional steel structure back-cable-free cable-stayed bridge main tower into two parts, consists of a steel structure stressed main tower 1 and a steel structure stressed auxiliary tower 2, and performs bridge tower counterweight on the steel structure main tower micro-expansion concrete pouring section 5 and the steel structure auxiliary tower micro-expansion concrete pouring section 6. The dead weight of the main tower is effectively increased to balance the strong overturning moment generated by the stay cable. The bridge tower is a composite steel structure bridge tower which adopts the structural forms of a main tower and an auxiliary tower and is weighted by concrete. Engineering materials which are wasted to the section size and height of the single main tower in the conventional back-cable-free cable-stayed bridge are transferred to the steel structure stressed main tower 1 and the steel structure stressed auxiliary tower 2 which are higher in concrete counterweight efficiency, so that the manufacturing cost and the construction difficulty of the main tower of the back-cable-free cable-stayed bridge are reduced, the span proportion of the tower height of the main tower and a main beam can be perfectly coordinated, and meanwhile, the asymmetric natural aesthetic feeling of the back-cable-free cable-stayed bridge is increased. Most importantly, the dependence of the cable-stayed bridge without the backstay on the self weight of the main tower is reduced, and a basic premise and favorable advantages are provided for designing a more harmonious and attractive bridge. The method can reduce construction risk (reduce tower height) and save investment (reduce main tower size) while improving the landscape of the bridge, has good economic benefit and popularization significance, and provides a new idea for the structural form of the cable-stayed bridge without a back cable.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
Claims (9)
1. A composite type back-cable-free cable-stayed bridge is characterized by comprising a steel structure main beam, a steel structure stressed main tower, a steel structure stressed auxiliary tower, a pier structure and a bridge abutment structure, wherein the steel structure stressed main tower and the steel structure stressed auxiliary tower are sequentially arranged on the steel structure main beam along the bridge direction;
a main tower stay cable is connected between the steel structure stressed main tower and the steel structure main beam, an auxiliary tower stay cable is connected between the steel structure stressed auxiliary tower and the steel structure main beam, a main tower micro-expansion concrete filling section is filled in the steel structure stressed main tower, and an auxiliary tower micro-expansion concrete filling section is filled in the steel structure stressed auxiliary tower;
the shapes of the steel structure stress main tower and the steel structure stress auxiliary tower are crescent curves.
2. The composite type backless cable-stayed bridge according to claim 1, wherein the main tower stay cable is connected with a main tower micro-expansion concrete pouring section; and the auxiliary tower stay cable is connected with the auxiliary tower micro-expansion concrete pouring section.
3. The composite backless cable-stayed bridge according to claim 1, wherein the steel structure stressed main tower and the steel structure stressed auxiliary tower are both filled with micro-expansion concrete in partial areas of the tower body for balancing weight, so as to form a micro-expansion concrete filling section for balancing weight, and effectively increase the dead weight of the main tower to balance the strong overturning moment generated by the stay cables.
4. The composite backless cable-stayed bridge according to claim 1, wherein the steel structure main beam, the steel structure stressed main tower and the steel structure stressed auxiliary tower are all prefabricated in a factory and are hoisted and welded after being transported to a site.
5. The composite backless cable-stayed bridge according to claim 1, wherein the size of the steel structure stressed main tower, the height of the tower body and the number of connected stay cables are all 1.5-3 times of the steel structure stressed auxiliary tower.
6. The composite backless cable-stayed bridge according to claim 1, wherein the steel structure stressed main tower and the steel structure stressed auxiliary tower are both backless cable-stayed bridge structures, and the main tower stay cables and the auxiliary tower stay cables are both pulled into a main span of the steel structure main beam;
the main tower stay cable is arranged in the span range of 2/3 of the main span at the side of the steel structure stressed main tower, and the auxiliary tower stay cable is arranged in the span range of 2/3 of the main span at the side of the steel structure stressed auxiliary tower.
7. The composite backless cable-stayed bridge according to claim 1, wherein the number of the stay cables is 9, 6 stay cables are provided for the main tower, 3 stay cables are provided for the auxiliary tower, and the distance between two adjacent stay cables for the main tower and the distance between two adjacent stay cables for the auxiliary tower are both 7-10 m.
8. The composite backless cable-stayed bridge according to claim 1, wherein pier structures are arranged below the steel structure stressed main tower and the steel structure stressed auxiliary tower; the abutment structure is arranged outside the pier structure.
9. The construction method of the composite backless cable-stayed bridge according to claim 1, comprising the steps of:
1) prefabricating a steel structure main beam, a steel structure stressed main tower and a steel structure stressed auxiliary tower in a factory in sections;
2) erecting a girder construction support platform, a construction pier structure and a bridge abutment structure;
3) the steel structure main beam, the steel structure stressed main tower and the steel structure stressed auxiliary tower are conveyed to a construction site section by section, the steel structure main beam sections are sequentially hoisted to the construction site, and the steel structure main beam is welded until the steel structure main beam is completely erected and welded;
4) erecting a steel structure stressed main tower and a steel structure stressed auxiliary tower construction support platform;
5) hoisting and welding the steel structure stressed main tower and each section of the steel structure stressed auxiliary tower section by section until the steel structure stressed main tower and the steel structure stressed auxiliary tower are capped;
6) sequentially carrying out erection and tensioning construction on the main tower stay cable;
sequentially carrying out erection and tensioning construction on the stay cables of the auxiliary tower;
7) after the construction of the stay cable is finished, the steel structure stressed main tower and the steel structure stressed auxiliary tower are respectively poured into a main tower micro-expansion concrete pouring section and an auxiliary tower micro-expansion concrete pouring section in partial areas of the tower body.
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2021
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| CN113062200A (en) | 2021-07-02 |
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